Grinding-machine



T. LUMSDEN.

GRINDING MACHINE.

APPLlcATloN FILED mms, 1920.

llvllllllllllhll \T. LUMSDEN.

GRINDING MACHINE.

APPLICATION FI'LED FEB. 25, 1920.

Patented July 19, 1921.

3 SHEETS-SHEET 2.

T. LUMSDEN.

GRINDING MACHINE.

APPLICATION man mms, 1920.

JU Tf 9M W 1l. 0 W

i s ...Ms V m m W na Vfor grinding snap Yrr 'rrr

@feminine-MACHINE.

Application led February 25, 1920.

To all 'zo/1.0m t may concern.'

Be it known that I, THoMAs LUMSDEN, a subject of the King of GreatBritain and Ireland, residing at Gatesheadfon-Tyne, in the county ofDurham, England, have. invented new and useful lmprovements in(ii'inding-ll/lachines, of which the following is a. specification. f

his invention relates to grinding Vmachines, and has for its object toprovide an improved construction of vgrinding machine adapted for use ingrinding gages and form tools.

A grinding machine in accordance with this invention comprises abcd,parallel guide rods carried thereby, a swinging arm pivotally mounted onone of said guide rods, a grinding wheel and a pointer carried by saidswinging arm, means for adjusting said pointer, means for rotating saidgrinding wheel, means 'for laterally adjusting said swinging arm, a worktable carrying both the blank to be ground and a former or pattern, saidwork' table being'mounted on another of said guide rods, means forangularly adjusting said worlr table, means for giving a hue lateraladjustment thereto, and la spring for returning the swinging arm. Insome cases a pointer having a reversed point may be used.

The accompanying drawings illustrate one construction of grindingmachine embody,- ing my invention. In Athe drawings Figure 1 is a frontelevation; and

Figs. 2 and 3 are elevations looking on the right and lel't hand sidesrespectively' on F ig. 1. f l

Fig. 4 is a part side elevation ofthe lower end ot' the swinging `armand the guide rod on which it ismounted;

5 is apart plan ofthe work table; and

Fig. 6 is an end elevation of the-lower end of the swinging arm and theguide rod on 'which it is mounted. Y

F ig. 7 is an elevation .of a. modified form of t le pointer hereinafterreferred to; Y

Fig. 8 is a section of a grinding wheel used gages; and l Fig. 9 is asection of a grinding wheel used for grinding form tools.

Referring to Figs. 1 to 6.oi the drawings,l the grinding machine thereinillustratedcomprises a bed 10 which carries in ibearings three parallelguide rods, 11, 12, 13 and a countershaft 14. The guide rod 11 isarranged to be moved lengthwise by means of Specification. of LettersPatent.

Patented sito 1a isti. serial no. 361,220.

the handwheel 15 onl a shaft 62 on which is also mounted Athe pinion 16which engages with an internally toothed wheel shaft 18, which is alsoprovided with a pin` ion 19 engaging a rack 2O on the underside of theguide rod 11. Mounted on the1 guide rod 11 1s a swinging arm 21 which"is prevented f-rom moving along the guide rod `bv two collars 22, 23(Fig. 4)

guide Iod 11. The swinging arm`21 carries a shaft 24 whereon is mountedtheorinding a pointer `26 and an operating'flever 27. 28

to which is ivoted a pin 29 carrying' a spring 30, said pinpassingthrough a lug l31 on the collar 23clamped to the 11. The springBObears againstthe `lug 31 and its tension can' be adjusted by means ofthe wing nut 32 on the end of the pin29 which is threaded.l i ThespringBO returns the arm` 21 tonormal position .v after-it has beenswung forward by theoperating lever 27. The swinging arm` 21is'also'provided with a lug 33 (Fig. 6) with'a set screw 34 whichco-acts with a fiXod lug 35 on the guide rod backward swing of the arm-21.

The pointer 26 is carried by a holder 36 mounted on a plate 37 attachedto the swinging arm 21 by boltsSS which pass through slots 39 and allowof vertical adjustmentv and by bolts 40`which pass through slots 41 andlallow of angularadjustment. j On the countershaft 14 'is mounted alongpulley 42. The shaft 24 is, provided with apulley 43 (F ig.f1) whichisadapted tobe driven by the pulley 42 through the belt 144. Thecounter-shaft v 14 is provided with fast and loose pnlleys`45, .46whereby itis adapted 17 on a clamped to theV guide rod which isjprovidedh 11. The set screw 34" iorms an adjustable/stop 'for limiting the` tobe driven `from a convenient source of rotary power. l l

The guide rod12'vcarri'es a table 47 pro vided" with slots 48 forreceiving the' usual bolts lfor holding the worlr and the `former orpattern. The work table 473is lcapableoi fangular adjustment about theguide rod 12 and- 1s clamped in position after adjustment by a lockingAnut 49 4provided with ahandle 5l)v mounted on a screwed part of theguiderod 13, said nut engagingfa lugl'on the'table 47` having a curved Slot52 lwhich embraces the;

guide rod 13. 'The worlrtable 47 slides on the guide rod 12Land-tinelateral adjustmentV is obtained by `means of the guide rod 13 which isscrewed at ,one end as shown (Fig 5). On the screw 53 is anutfi workingin a casing 55K/andrestrained against axial movement, said Vnut .beingprovided pointerQG engagesy with the" former when the type'illustratedin Figs. :1, 2, 3

the grinding wheel, which is swung forward and heldup to the work bylthe lever 27 against tlieresistance of the sprlngBO, en-

pointer 26m-acting with the former insuresl that'tlie wheel cuts theshape,T the wheel and pointer laterally by" the` hand wheel blank to'the desired being moved 15,1thel blank being thus ground .to the` shape`or" the former. Y Y j WVhen it isdesired to grind' a snap gage,

the gage is first-roughly Y above described, using a grinding wheelerand theguide rod 1l is then locked byni'eansl of the clampingleverY 60'(Figs. 'lfandf 3) and the work .table 47 moved: laterallyby the worinadjustment operated'jby the graduated handwheel 59 to grind Vthe gage tothe enact finished size. f Y Y j In somecases I maylsubstitute a pointerhaving a reversed end 61 as shown in/Fig. 'i'

so that thegrinding wheel mayproduce the converse of theV former.

VVh'at I claim and desire ters Patent, is z- ,I i f la Agrinding machinecomprising' a'bed, parallel guide rods carried thereby, a swingingarmpivotally mountedon one of said guide rods, a grinding wheel and apointer carried by said'swinging arm,vm`eansfor roto seeure 'by Let- Ytating said grinding wheel, 'means 'for laterallyk adjusting saidVswinging arm, work -tablevcarryingboth the blank to"V be ground yand alformer, s ai-lvwork table being mounte'dfon another of' saidV guiderods, resilient means normally-.keeping the grinding wheel away from4the blank to be ground,! and means for manuallypfswinging"tliefgrindingwheel into contact with the blank and `holiding it'f'there during thegrinding'operation S( against the 'resistance of said resilient mea 2. Agrinding machine,

" parallel guide rods carried-thereby, aswing-VV ing arm pivotallymounted on one of said guide vrods,a-grinding wheel-and apointer carriedby said lswlngingJ-arm, means for` rot-ating 'said grinding viwheel,'means vfor laterallyy adjusting said at 53y table, resilient meansshaft 58vprovided desired to grind i ages a corresponding partof theblank, the y ground to size asv j with theblank and 8,VV

comprising 'a bed,

"swinging, varm, Werk, @eb-1e @affres boil@ the blaakte De ground and aformer, said work table being mounted Lonanotlier of said guide rods,means for angularly adjusting said work normally keeping the grindingwheel away fromtlie blank to be ground, and means for manually. swingingthe grinding wheel into Contact with the :blankand holding itthereduring the grinding operation against the resistance oi Vsaid resilientmeans. f1" f Y j 3.' A` grinding machine comprising a'bed, parallelguide rods carried thereby.l a swingingarm pivotally-mounted*on one orsaid guide' rods, a grinding wheel and a pointer carried by saidswingingarm,`ineans `For rotating vsaid grinding wheel, means ioi' laterallyadjusting said swinging ari-iu, a work table carrying both the blank tobe ground and atormer, said work table being mounted on another of saidguide rods, means for angularly` adjusting 'said -vork table, means forgiving aline lateral adjustment thereto, 'resilient mea-ns normallykeeping the grinding wheel away troni the blank to be ground, and meansfor manually swinging the grinding wheel into Contact 'and holding itthereduring the grinding operation against the resisinnceA of saidresilient means.

4; A grinding machine comprising a bed,

Y parallel guidejrods carried thereby, a swing-y ing armpivotallymounted on one of said guide'rods, a grindingswheel andA apointer carried by'said swinging arrm'ineans 'for ad# justiiig saidpointer, means'ioi" rotating said grinding wheel, ,means for; laterallyadjusting said swinging arm, a worktable carrying both the blankV to vbe"ground and a former, said Vwork table being Vmourned en another of saidguide ro'dftlresilient means normally keeping the grinding wheel awayfrom theblank to be ground, V'and ineens tor manually swinging thegrinding *"ifbeel into contact with the blank and holding it thereduring the grinding operation against the resistance of said resilientmeans.

'. 5. A'grinding `machine'comprising a bed,

parallel-guide rods ca 'ried thereby, a swinging arm pivotally'mount-edonfone of sani guide rods, a grinding wheel and a'poinizer carriedbyjsaidjfswinging arm, means 'iur rotating said gri nding wheel,laterally adjusting saidfswingng arm, a work ytable c'arryingfbothtlieblank te be ground anda former, aidwo'rk table being mounted onanother otsaid guide rods. a spring for returning -theswinging jarin,and means for `manu all y swin'ging` the j grinding wheel intocontactwith the'bl ank and hold-` ing itfthere during the grindingoperation against thetension'of f said springf name,tothis'specification.=v A' LUMSDFNE In testimony wliereot'l' have,signed my 'means forr llO

